- #LINUX OPC DA CLIENT HOW TO#
- #LINUX OPC DA CLIENT SERIAL#
- #LINUX OPC DA CLIENT SOFTWARE#
- #LINUX OPC DA CLIENT PC#
- #LINUX OPC DA CLIENT WINDOWS#
In today’s world, we need to move data between all sorts of embedded devices, some with specialized operating systems and software, and enterprise/internet systems. It was a really good solution to this problem.īut now, 20 years later with the advent of WIN 10, COM exists but it’s no longer explicitly supported. All of the Microsoft applications, like Excel, Word and PowerPoint, had the ability to integrate COM data.
#LINUX OPC DA CLIENT PC#
COM was something that every PC application could support. The designers of what came to be called OPC chose Microsoft COM as the underlying mechanism for OPC. No matter what device or communications strings were transferred, the application program would receive the data in the same way. The communications protocol – the bits and bytes that actually moved over the wire – would be hidden from the application program. A group of system integrators got together and came up with this idea to have a standard mechanism to interface with a driver. That was time-consuming and expensive – great for an SI that billed by the hour, but not so great for the manufacturer paying the bills.
#LINUX OPC DA CLIENT SERIAL#
System integrators of the day wanted to write applications for PCs, and their only choice to get data was to write custom drivers to get that serial data. Most devices had a UART (Universal Asynchronous Receiver/Transmitter) and could do some data transfer (you might remember DB25 and DB9 connectors). The only open way to move data was serial communications. There was Data Highway if an automation device vendor was a partner of Allen-Bradley, but not much more than that. Sometimes, Remote I/O was used, and those cards were remote in another rack off on another part of the machine. Everybody had those monstrous PLC5 racks with tons of analog and digital I/O cards. In those days, PLCs connected to I/O points with physical wires. It was even before DeviceNet and Profibus DP.Īnd most of all, it was before EtherNet/IP, Modbus TCP and PROFINET IO. Remember, this was before EtherNet/IP and PROFINET IO. Starting in the 1990s when PCs first hit the manufacturing floor, it became the preferred way to get data out of a drive, a linear actuator or any other industrial device. OPC – what we now called OPC Classic – had a really good run.
#LINUX OPC DA CLIENT WINDOWS#
OPC DA is no longer the preferred mechanism for moving data from an industrial automation device into a Windows application. That’s an interesting question, and the premise is very true.
#LINUX OPC DA CLIENT SOFTWARE#
Other OPC server software displays these numerals correctly.A reader sent me this question a few weeks back: “ I see that OPC DA seems like it is being dropped by just about everybody. This reading changes from 0 to -1 (OFF & ON) instead of 0 to 1. The digital input channel shows "-1" which displays within our OPC client software when using NAPOPC DA server and the channel with "ON" condition. Is this a known problem and do you have a method to fix this? NAPOPC DA server uses 95-99% of CPU time independent of the polling rate that I specify in lookout. What is the performance of NAPOPC DA Server?Īfter upgrading a NAPOPC DA Server, why did I receive the following error message box.
#LINUX OPC DA CLIENT HOW TO#
How to make sure that the NAPOPC DA Server loads the correct configuration file? The error "File NapOPCSvr is linked with no exist Export-OLE32.DLL: CoInitalizeEx" message pops up when starting up. On Windows 95, we received problems during the NAPOPC DA Server installation. Class not registered." message occurs while connecting to the NAPOPC DA Server.
The "Error connecting to OPC 2.0 Server Browser. The NAPOPC DA Server individually detects all modules, but cannot simultaneously detect the second and first modules on the network. The NAPOPC DA Server shows OK for only one second and again shows bad status. The NAPOPC DA Server shows BAD status with the I-7017 module? How to fix it? How to hide the window of NAPOPC DA Server to prevent unexpected termination by other users? The "run-time errors '91' "message occurs while VB client demo connect to the NAPOPC DA Server?ĭo NAPOPC DA Server support PCI card module?
How about the limit of NAPOPC DA Server for tag number using Modbus communication? How to solve NAPOPC DA Server show "Bad" using OPCLink connect to InTouch? How to develop OPC Client under environment of Microsoft. Why the NAPOPC DA Server show error value when I use Modbus Utility setting address number? What the tag limitation in each group when connects through Modbus protocol? Why does the COM port which greater than ten still can't connect normally? (The document notified the modification of this on version 2.15) ?
0 kommentar(er)
